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H54C-08 Wet-season throughfall in primary and secondary tropical montane forests, Monteverde, Costa Rica Andrew J. Guswa1, Amy L. Rhodes2 1Picker Engineering Program, Smith College 2Department of Geology, Smith College December 17, 2004
2 Hypothesis Vegetation structure controls throughfall variability. Therefore, we expect persistence in throughfall at a point depth of throughfall to be correlated with measures of vegetation structure
3 Site Location: Monteverde, Costa Rica Q S o c o r r oRio Guacimal Monteverde Secondary Forest Site Primary Forest Site N 1 km
4 Throughfall sampling design Manual collection of throughfall, 4 times per week, from June 11 through July 24, 2004. Grid of stationary collectors (16 or 20) Set of mobile collectors (6)
5 Throughfall varies spatially Primary Forest Secondary Forest TF depth (mm) (m)(m) (m) (m)
6 Throughfall varies spatially Fraction of Collectors Primary Forest Secondary Forest Depth over 6 weeks (mm) Depth over 6 weeks (mm) = 240 mm = 114 mm TF/P = 80% = 191 mm = 57 mm TF/P = 63%
7 Throughfall vs. Open Rain Average Throughfall Depth (mm) Average Throughfall Depth (mm) Primary Forest Secondary Forest MVI Rain (mm) MVI Rain (mm) mm 3 PTF PTF 4.0 mm 10 PTF
8 No correlation with simple measures of vegetation structure % Cover Diameter of nearest tree Distance to nearest tree Primary 86 100 14 116 cm 0.5 6.0 m Secondary 81 100 11 267 cm 0.7 4.3 m Throughfall showed no correlation with these measures of vegetation structure.
9 Variogramanalysis of griddeddata shows no correlation Lag (m)S e c o n d a r y F o re s tPrimary Forest (h) Combined data indicate a slightly larger correlation length for the secondary forest than the primary.
10 Variability is a function of space, but nearly time invariant Weekly depths from grid of collectors are normalized. ANOVA is conducted with collector number as the treatment. Week-to-week variability for a single collector is much smaller than variability among collectors: Primary Forest: F = 95, p << 0.01 Secondary Forest: F = 16, p << 0.01
11 Single collectors can be reliable predictors of average throughfall Tipping-Bucket Depth (mm) Primary Forest Secondary Forest Average Throughfall Depth (mm) Tipping-Bucket Depth (mm) Average Throughfall Depth (mm) 71.0/ TFTB0.3% error for second half 23.1/ TFTB8% error for second half calibration verification
12 Conclusions Spatial variability is persistent through time. Correlation lengths are short. Throughfall is controlled by small-scale vegetation structure. Once calibrated, a single collector may provide information on average throughfall.
13 Questions? Thanks to: Monteverde Institute Silvia Newell Elizabeth Koenig Mai Kobayashi IlonaJohnson
14 Single collectors can be reliable predictors of average throughfall Tipping-Bucket Depth (mm) Primary Forest Secondary Forest Average Throughfall Depth (mm) Tipping-Bucket Depth (mm) Average Throughfall Depth (mm) 71.0/ TFTB 68.0/ TFTB 23.1/ TFTB 34.1/ TFTB(sum) (line)15% error (sum) (line)4% error
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Guswa, Andrew J.
El exceso de agua en las hojas que caen al suelo en la epoca lluviosa en bosques tropicales primarios y secundarios, Monteverde, Costa Rica.
Wet-season throughfall in primary and secondary tropical montane gorests, Monteverde, Costa Rica.
g El 14 de diciembre 2004/December 17, 2004.
Books / Reports / Directories
Primary and secondary forests
Bosques primarios y secundarios
Scanned by Monteverde Institute.
Andrew J. Guswa
t aThe State of Water in Monteverde, Costa Rica: A Resource Inventory.